The formation of Western categories of gay/straight, and the identities politics which are predicated on this formation, have largely erased bisexuality. This erasure is evident in both scholarly and community discourses, although in recent years in the UK there have been increasingly successful attempts to include bisexuals alongside lesbians, gays and trans people under the ‘LGBT’ acronym. Whilst bisexual people have become (arguably) more socially visible, there remains a large gap in contemporary sex/gender scholarship around bisexuality. This talk aims to begin to map out the territory, building on the existing work of scholars working mostly within sociology and cultural studies. The talk discusses possible directions for analysis, including interationaism, poststructuralism, queer theory and trans theory. It suggests that a materialist analysis is important in understanding the lived experiences of bisexual people, in keeping with a broader materialist turn within the social sciences. The talk draws on empirical material from research conducted in the UK.